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UC2864DW from UNI, 105pcs , 7.2*16,Resonant-Mode Power Supply Controllers
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UC2864DW UNI N/a 105

FEATURES DESCRIPTION. Controls Zero Current Switched (ZCS) The UC1861-1868 family of ICs is optimized for the control of Zero Cur-or Zelro Voltage Switched (ZVS) rent Switched and Zero Voltage Switched quasi-resonant converters. Dif-Quasi-Resonant Converters ferences between members of this device family result from the variouscombinations of UVLO thresholds and output options. Additionally, theo Zero-Crossing Terminated One-Shot . . . . , .one-shot pulse steering logic IS configured to program either on-time forTimerZCS systems (UC1865-1868), or off-time for ZVS applications (UC1861-0 Precision 1%, Soft-Started 5V 1864).Reference . . . . .The primary control blocks implemented include an error amplifier to com-q Programmable Restart Delay pensate the overall system loop and to drive a voltage controlled oscillatorFollowing Fault (VCO), featuring rogrammable minimum and maximum frequencies. Trig-p. Voltage-Controlled Oscillator (VCO) gered by the VCO, the one-shot generates pulses of a programmed maxi-with Programmable Minimum and mum width, which can be modulated by the Zero Detection comparator.Maximum Frequencies from 10kHz to This circuit facilitates "true" zero current or voltage switching over various1MHz line, load, and temperature changes, and is also able to accommodate the. resonantcom onents' initialtolerances.q Low Start-Up Current (150HA typical) pUnder-Voltage Lockout is incorporated to facilitate safe starts uponq Dual 1 Amp Peak FET Drivers power-up. The supply current during the under-voltage lockout period is. UVLO Option for Off-Line or DC/DC typically less than 150PA, and the outputs are actively forced to the lowApplications state. (continued)16.5/10.5 16.5/10.5 8/7 8/7 16.5/10.5 16.5/10,5 8/7 8/7Alternating Parallel Alternating Parallel i Alternating Parallel I AlternatingOff Time Off Time Off Time Off Time On Time On Time On TimeFaultandLogic 5VPrecisionReferenceSteeringLo icg .8 OutPwr GndPin numbers refer to the J and N packages. UDG-92018SLUS289B - OCTOBER 1998 - REVISED SEPTEMBER 2007DESCRIPTION (cont.)UVLO thresholds for the UC1861/62/65/66 are 16.5V(ON) and 10.5V (OFF), whereas the UC1863/64/67/68thresholds are 8V (ON) and 7V (OFF), After Vcc ex-ceeds the UVLO threshold, a 5V generator is enabledwhich provides bias for the internal circuits and up to10mA for external usage.A Fault comparator serves to detect fault conditions andset a latch while forcing the output drivers low. The Soft-Ref pin serves three functions: providing soft start, restartABSOLUTE

UC2864DW ,Resonant-Mode Power Supply ControllersFEATURES DESCRIPTION. Controls Zero Current Switched (ZCS) The UC1861-1868 family of ICs is optimiz ..
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